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Just a data point...
I've seen the green silicone o-rings disintegrate.
This was on a very high mileage 13B engine - over 200,000 miles.
The green silicon o-ring cracked into little segmented pieces - about an inch each section.
Each piece could be then squished between your fingers; the consistency was like a piece of cheese.
We ended up with the car with unknown history.
We can't confirm if the engine had been overheated.
We can't confirm if the engine has been frozen - this was in Sacramento, CA.
The engine was torn down because of excessive oil smoke, especially at higher revs - a sure sign of oil control ring failure.
This was a non-turbo FC.
All other seals were intact - water jack o-rings, inner and outer.
Almost everything else internally looked okay.
We replaced soft seal and apex seals (which were all under spec) and put back the engine for the rebuild.
-Ted
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